Wessle, you are confusing "evolution" with "adaptation". Evolution just describes the process of changing. Adaptation just describes the process of fulfilling a niche. Evolution does not always result in adaptation. That's why most of it ends in failure and death.
You can't be more evolved - more adapted, maybe, but not more evolved. Evolution is not quantitative. Your race of supermen? I might call them better adapted, sure, but not more evolved. That is not something that makes sense according to the definition of the word "evolution".
Edit: Actually I wouldn't even call them better adapted. People that size would need more food and produce a lot more body heat, limiting the number of environments in which they could survive. Their population would necessarily be limited by biological differences.
